Homeroom READ!!!!!! Or study for your cell quiz. Sit in your assigned seat. All pencils must be sharpened before the bell

rings.

The Skeletal System

Warm-up: Describe how your life would be without bones.

What is a Bone? The skeletal system is made up of the bones

and cartilage that forms the framework of your body.

We have bones so that we are not a puddle of skin and guts on the floor.

Babies have 300 bones. Adults have 206 bones.

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The Inside of a Bone A bone is made up of salts, water, and tissue. Inside a bone there is a jelly substance called

bone marrow. Bone marrow produces blood cells for the

body.

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Four Main jobs of a Bone:1. To protect your body and

give it shape.2. To protect your internal

organs.3. To provide a scaffolding for

your muscles, allowing you to move.

4. To store minerals and make blood cells.

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The Spine The spine is the central support

for the body. The spine is made up of separate

bones called vertebrae. Between each vertebrae is

cartilage which keeps bones from rubbing against each other.

FUN FACT: there are 26 vertebrae in the human body.

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Ribs “Your rib cage is made up of 12 vertebrae, 24

ribs and a breastbone in three parts. It protects your heart and lungs from knocks and bumps.”

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Hands and Feet

The bones in your hands and feet are VERY flexible. The foot has 26 bones. (tarsals, metatarsels, and

phalanges) The hand has 27 bones. (metacarpals, carpals, and

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Hips and Legs The hip bone helps us to

stand upright and move. The main bones of the legs

are the tibia, fibia, and femur.

The patella (kneecap) is also important!

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Arms The bones in the arm are very

flexible. The three bones that make up

the arm are the ulna, radius, and humerus.

The two bones that form the shoulder are the clavicle and the scapula.

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JointsThe Pivot Joint Hinge Joint

The Gliding Joint Ball-and-socket Joint

View More on Joints!

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Quiz1. How many bones are in an adult? 4. What is another name for kneecap?A. 342 bones A. SternumB. 100 bones B. PhalangesC. 85 bones C. TibiaD. 206 bones D. Patella

2. What is the jelly substance inside a bone called? 5. The legs are connected to what ?E. Cartilage A. The Hips (Pelvis)F. Bone Marrow B. SkullG. Compact Bone C. HandsH. Joints D. Heart

3.What Bone protects the internal organs BONUS QUESTION!!! like the lungs and heart? What joint is found in the ankle?I. The Spine A. Pivot JointJ. The Femur B. Gliding JointK. The Ribs C. Hinge JointL. Pelvis D. Ball-and-socket Joint

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Pasta Skeleton Using the pasta in the box, create a human

skeleton with your partner. You must include 15 bones!

ARE YOU MEAN You are to work alone because of measuring Follow the instructions carefully DO NOT BEND OR CREASE THE RULERS Once you have finished get a calculator and

take an average of your differences